Within the Ancient Demon Realm, inside a palace.
The Three Great Demon Kings stood before Ye Yunfei.
"Now, I am going to plant a Soul Restriction in your Sea of Consciousness," Ye Yunfei said, his voice clear and commanding. "You must cooperate fully and not show the slightest intention to resist. Otherwise, your Soul Body will explode, turning to ashes. Do you understand?"
"We understand," the three Demon Kings nodded.
They knew they had no other choice.
"Still, I should first refine a batch of pills to protect the Soul Body and restore Soul Power. That way, I can make them take some anytime to protect their Soul Bodies, so they won't die so easily," Ye Yunfei thought to himself.
Thus, Ye Yunfei entered the Phantom Tower and began pill refinement.
One day later, Ye Yunfei had refined a large quantity of pills specifically designed to protect the Soul Body and restore Soul Power, all of them of high grade.
Next, Ye Yunfei began planting the Soul Restriction into the three Demon Kings.
Starting with Demon King Baigu.
Agh... Aaaah...
During the process of planting the Soul Restriction, Demon King Baigu felt a splitting headache and screamed continuously. This was because planting the Soul Restriction was essentially carving a symbol onto his very Soul Body — a pain stemming from the deepest reaches of the soul! Moreover, it was extremely dangerous; the slightest misstep could destroy the Soul Body.
"Agh! Master Ye, I can't bear it! I'm about to die!" Demon King Baigu shrieked.
Ye Yunfei immediately took out several pills and stuffed them into Demon King Baigu's mouth. A torrential wave of medicinal power enveloped and protected the Demon King's Soul Body. Only then did Demon King Baigu feel somewhat relieved.
This situation repeated six or seven times. Once, Demon King Baigu even lost all sensation completely, his Soul Body teetering on the verge of annihilation. Fortunately, Ye Yunfei timely forced several saint-grade pills into his mouth, bringing him back from the brink of death.
One day later.
Finally, Ye Yunfei succeeded in planting a Soul Restriction within Demon King Baigu's Soul Body.
"Success. Planting a Soul Restriction on an Imperial Realm expert is too laborious and dangerous! It's fortunate it succeeded," Ye Yunfei couldn't help but sigh with emotion.
Truthfully, during the process of planting the restriction on Demon King Baigu, Ye Yunfei himself had nearly suffered a backlash several times, risking injury to his own Soul Body.
"Master..." Demon King Baigu lay slumped weakly on the floor, his voice feeble. At this moment, he had no strength left.
"Take these pills and recover properly," Ye Yunfei nodded, handing Demon King Baigu a bottle of pills before teleporting him into the Phantom Tower.
Next, Ye Yunfei planted the Soul Restriction on Demon King Aoyue.
With the experience gained from working on Demon King Baigu, planting the restriction on Demon King Aoyue was somewhat easier. However, it still took a full day to achieve success. By then, Demon King Aoyue was also hanging by a thread, not far from death. Ye Yunfei gave him a bottle of pills and sent him into the Phantom Tower to recover.
Finally, Ye Yunfei spent another day and successfully planted the Soul Restriction on Demon King Wuque!
All three Demon Kings had officially become Ye Yunfei's slaves!
"We pay our respects to the Master!" The Three Great Demon Kings stood before Ye Yunfei and called out respectfully. After taking the pills Ye Yunfei had given them, the three Demon Kings had completely recovered to their peak condition.
At this moment, the three Demon Kings harbored not a shred of disloyalty toward Ye Yunfei. They knew that from now on, their life and death rested entirely on Ye Yunfei's will!
"Is your Ancient Demon Race very eager to go to the true Demon Realm?" Ye Yunfei asked.
"Replying to Master, yes," Demon King Wuque answered. "This branch of our Ancient Demon Race has always longed to return to the Ancestral Realm. The environment of the Ancestral Realm is more suitable for our cultivation, and it holds a vast number of high-grade demon inheritances. Compared to the Ancestral Realm, our Ancient Demon Realm is merely a small world, insignificant."
"I understand," Ye Yunfei nodded. "However, you don't need to go to the Ancestral Realm. I can provide you with the purest demonic energy and high-level demon cultivation techniques. I guarantee they won't be inferior to those found in the Demon Realm."
"The purest demonic energy? High-level demon techniques?" The three Demon Kings looked at Ye Yunfei with doubtful eyes upon hearing this. They were somewhat skeptical. Although Ye Yunfei's strength far surpassed theirs, he was ultimately human, and the techniques he cultivated were human ones. Moreover, in their eyes, Ye Yunfei was, at the end of the day, just a young human. How could he possibly provide them with the purest demonic energy and high-grade demon techniques?
Whoosh! Whoosh!...
Ye Yunfei waved his hand. Pill after pill flew out and landed before the three Demon Kings. Each pill emitted an extremely rich, potent aura of demonic energy!
These pills were all refined personally by Ye Yunfei. In truth, Ye Yunfei had long ago refined large quantities of demon-type pills for Hu Miao. Moreover, as an Alchemy Venerable, even the top experts of the Demon Realm from the demon clans had sought pills from Ye Yunfei. Refining demon-type pills was an extremely simple task for him.
"Such pure demonic energy!" Feeling the rolling demonic aura released by the pills before them, the three Demon Kings instantly became excited, their bodies even trembling slightly. The demonic energy contained within these pills was simply too dense, too pure!
"Master, these are all pills for our Demon Race! Where did you obtain them?" Demon King Baigu asked in a trembling voice.
"You can have as many of these pills as you want. Once you've used them up, just tell me whenever you need more," Ye Yunfei waved his hand dismissively.
Now that these three Demon Kings were his slaves, the stronger they became, the better. Naturally, Ye Yunfei would not be stingy.
"As many as we want!" Hearing Ye Yunfei's words, the three Demon Kings jolted, their faces lighting up with ecstatic joy.
"Thank you, Master!" The three Demon Kings carefully stored away those pills.
"Fortunately, I unintentionally obtained a few demon techniques in the past. Take them and cultivate," Ye Yunfei waved his hand again, and several jade slips containing cultivation techniques flew out, landing before the three Demon Kings.
The three Demon Kings hurriedly released their Soul Power to sense the contents of the jade slips.
Hiss!
The next moment, all three Demon Kings wore stunned expressions, their faces filled with disbelief.
"Master, these techniques are indeed from our Demon Race, and they are extraordinarily profound!" Demon King Aoyue said to Ye Yunfei, his voice shaking. "In my entire life, I have never seen demon techniques so profound!"
"These demon techniques are indeed quite good. Take them and cultivate," Ye Yunfei stated.
These demon techniques were something Ye Yunfei had incidentally acquired from a powerful demon expert. There was a period where Ye Yunfei had specialized in collecting all sorts of techniques and martial skills from across the world, so he had dabbled in the techniques of various factions and races.
"We thank Master for this immense gift of techniques!" The three Demon Kings were extremely moved, meticulously storing away the jade slips.
Suddenly, they realized that becoming Ye Yunfei's slaves seemed like an incredibly wise choice. The demon-type pills and demon cultivation techniques Ye Yunfei had given them were priceless treasures! Treasures they had previously only dreamed of obtaining!
At this very moment, deep in their hearts, the three Demon Kings no longer seemed to resent being Ye Yunfei's slaves. Instead, they felt a glimmer of hope for the future.